package com.hailan.pc;

/**
 * @ClassName A
 * @Description TODO
 * @Author hailan
 * @Date 2020-08-31 20:28
 * @Version 1.0
 */
public class A {
    public static void main(String[] args) {
        Data data = new Data();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"D").start();
    }


}

class Data{
    private int number = 0;

    public synchronized void increment() throws InterruptedException {
        while (number!=0){
            //等待
            this.wait();
        }
        number++;
        //通知其他线程 我+1完毕了
        System.out.println(Thread.currentThread().getName()+"=>"+number);
        this.notifyAll();
    }

    public synchronized void decrement() throws InterruptedException {
        while (number==0){
            //等待
            this.wait();
        }
        number--;
        //通知其他线程 我-1完毕了
        System.out.println(Thread.currentThread().getName()+"=>"+number);
        this.notifyAll();
    }
}